Glow Plug/Heater Indicator Circuit Malfunction
Electrical fault in the glow plug indicator lamp or relay circuit. The ECU monitors driver feedback to ensure the dashboard indicator can be commanded; an open or shorted circuit triggers this code.
Affected components
- Glow plug indicator
- Indicator wiring
Common causes
- Medium likelihood: Indicator bulb or LED failed
- Medium likelihood: Wiring or connector fault
Possible symptoms
- Glow plug warning light on (often orange coil symbol)
- Hard cold start or no start in cold weather
- White smoke from exhaust during warm-up
Diagnostic notes
- The malfunction indicator lamp may illuminate
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.